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Method for allowing temporary mechanical access to a multilateral junction through a landed and set upper completion and then re-sealing to allow commingled flow from the junction on final completion of the well. Disclosure Number: IPCOM000189551D
Publication Date: 2009-Nov-12
Document File: 4 page(s) / 598K

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The Prior Art Database


Construction of multilateral junctions where segregated flow is required often results in a construction/completion methodology that removes the ability to access mechanically; one of the bores after the upper completion is installed. This document outlines a possible method that will allow the possibility to access either main or lateral bore through the installed/landed upper completion in the event that contingency intervention access is required, prior to the well being placed on production. Once the intervention has been performed the access will then be limited in order to allow individual well flow control from each branch.

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Method  for  allowing  temporary  mechanical  access  to  a  multilateral  junction  through  a  landed  and  set  upper  completion and then re‐sealing to allow commingled flow from the junction on final completion of the well. 


Construction of multilateral junctions where segregated flow is required often results in a construction/completion  methodology  that  removes  the  ability  to  access  mechanically;  one  of  the  bores  after  the  upper  completion  is  installed. This document outlines a possible method that will allow the possibility to access either main or lateral  bore through the installed/landed upper completion in the event that contingency intervention access is required,  prior to the well being placed on production. Once the intervention has been performed the access will then be  limited in order to allow individual well flow control from each branch. 


One of the problems facing multilateral wells is isolation of the previously constructed branch while drilling and  completing the new lateral branch. In some applications this may not be a significant concern, as the fluid weight  differential  or  pressure  exerted  on  each  branch  may  not  be  significantly  different.  However,  depending  on  the  reservoir completion and the specific application, the difference between the completion fluid in one branch and  the drilling fluid required to drill the second branch, may dictate that a dedicated device is installed in the already  completed  branch  to  provide  temporary  isolation  of  one  branch  relative  to  the  other.  This  isolation  can  be  achieved  using  a  variety  of  methods,  typically  using  fluid  loss  control  devices  installed  in  the  lower  reservoir  completion in each branch. The majority of the fluid loss control devices are activated by the application of direct  pressure or pressure cycling to open these devices as the primary method, with mechanical shifting tools or similar  as the contingency option to open these devices in the event of failure to open by the primary method.   In many multilateral applications, through completion intervention access to either branch throughout the life of  the well is not a requirement; through completion intervention access to the branch is a desirable feature prior to  production start up, in the event that these devices require to be opened mechanically should pressure or other  remote operation method fail to funct...